中文说明：对测试图像分块、DCT和量化，将量化后的系数写成矩阵形式。
English Description：
The test image is partitioned, DCT and quantized, and the quantized coefficients are written in matrix form.
The test image is divided into blocks, DCT and quantization
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中文说明：对测试图像分块、DCT和量化，将量化后的系数写成矩阵形式。
English Description：
The test image is partitioned, DCT and quantized, and the quantized coefficients are written in matrix form.